When the suppressors become more widely available, there may be some stolen, but when they find out that they can't use them on the guns they have they will most likely chunk them or try to pawn to someone for cash. Unless they steal the gun along with it, I don't believe they will take one and go in search of a barrel for their stolen gun to make use. I believe the thugs use will be happenstance. If they happen upon one they will use it if gun and suppressor match. Another poster on a different site said they mainly use a gator aid bottle and a roll of toilet paper now which is readily attained. I guess that is no different than some making use of an oil filter or flashlight tube.